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AUSCERT External Security Bulletin Redistribution
vino security update
2 December 2019
AusCERT Security Bulletin Summary
Operating System: Debian GNU/Linux 8
Impact/Access: Access Privileged Data -- Remote/Unauthenticated
Denial of Service -- Remote/Unauthenticated
CVE Names: CVE-2019-15681 CVE-2018-7225 CVE-2014-6053
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Package : vino
Version : 3.14.0-2+deb8u1
CVE ID : CVE-2014-6053 CVE-2018-7225 CVE-2019-15681
Debian Bug : 945784
Several vulnerabilities have been identified in the VNC code of vino, a
desktop sharing utility for the GNOME desktop environment.
The vulnerabilities referenced below are issues that have originally been
reported against Debian source package libvncserver. The vino source
package in Debian ships a custom-patched and stripped down variant of
libvncserver, thus some of libvncserver's security fixes required porting
The rfbProcessClientNormalMessage function in
libvncserver/rfbserver.c in LibVNCServer did not properly handle
attempts to send a large amount of ClientCutText data, which allowed
remote attackers to cause a denial of service (memory consumption or
daemon crash) via a crafted message that was processed by using a
single unchecked malloc.
An issue was discovered in LibVNCServer.
rfbProcessClientNormalMessage() in rfbserver.c did not sanitize
msg.cct.length, leading to access to uninitialized and potentially
sensitive data or possibly unspecified other impact (e.g., an integer
overflow) via specially crafted VNC packets.
LibVNC contained a memory leak (CWE-655) in VNC server code, which
allowed an attacker to read stack memory and could be abused for
information disclosure. Combined with another vulnerability, it could
be used to leak stack memory and bypass ASLR. This attack appeared to
be exploitable via network connectivity.
For Debian 8 "Jessie", these problems have been fixed in version
We recommend that you upgrade your vino packages.
Further information about Debian LTS security advisories, how to apply
these updates to your system and frequently asked questions can be
found at: https://wiki.debian.org/LTS
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